<template>
    <radio-group v-model="option" style="width: 300px; background-color: aqua;">
        <radio label="男" value="man" style="font-size: 40px;"></radio>
        <radio label="女" value="woman" style="font-size: 40px;"></radio>
    </radio-group>
</template>

<script>
export default {
    data() {
        return {
            option: "man"
        }
    },

    watch: {
        option: function (new_value, old_value) {
            console.log("v-model=option", new_value);
        }
    }
}
</script>